<?php defined('_JEXEC') or die('Restricted access');

jimport('joomla.installer.installer');
jimport('joomla.installer.helper');

function install($parent) {
	echo JText::_('COM_PRODUCTMANAGER_INSTALL_SUCCESSFULL');
}

function update($parent) {
	echo JTEXT::_('COM_PRODUCTMANAGER_UPDATE_SUCCESSFULL');
}

function preflight($type, $parent) {
	//...
}

function postflight($type, $parent) {
	//...
}